DP Biology (last assessment 2024)
Question 17N.3.HL.TZ0.17b
| Date | November 2017 | Marks available | [Maximum mark: 2] | Reference code | 17N.3.HL.TZ0.17b |
| Level | HL | Paper | 3 | Time zone | TZ0 |
| Command term | Describe | Question number | b | Adapted from | N/A |
b.
[Maximum mark: 2]
17N.3.HL.TZ0.17b
(b)
Describe the relationship between Zooxanthellae and reef-building coral species.
[2]
Markscheme
a. «endo»symbiotic/mutualistic relationship
b. zooxanthellae/photosynthetic algae/dinoflagellates live in coral tissues
c. coral provides protection for algae/dinoflagellates
d. algae/dinoflagellates provide minerals/products of photosynthesis/oxygen/sugars to coral
[Max 2 Marks]
